Why are people still using lanterns?? Get yourself a chunk of square steel, hold in 4 jaw, hole through the middle, clamp down on top of compound, milling cutter in chuck, 8 tapped holes & you've got a 4 way that holds any sort of tool.? This assumes you don't want to lay out €?$ on a QCTP.

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Eddie

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-------- Original message --------

From: Robert Bradley <rcbradley@...>

Date: 07/03/2024 00:03 (GMT+00:00)

To: [email protected]

Subject: Re: [SouthBendLathe] Indexable carbide insert turning tools

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Should be easy to replace the rocker with a rectangular piece, height may have to be shimmed to get top of insert on centerline of the workpiece.

From: [email protected] <[email protected]> on behalf of mike allen <animal@...>
Sent: Wednesday, March 6, 2024 3:24 PM
To: [email protected] <[email protected]>
Subject: Re: [SouthBendLathe] Indexable carbide insert turning tools

That would make a lot of sense . The AR Warner cutters I have go through just about anything I put in front of them like butter . I just get them on center line & go . If ya are using a lantern tool post I would think that ya just have to find the right recipe for a shim to go under the tool holder & on top of the rocker . I would get rid of the rocker & get a hunk of 1/2 or 3/8" key stock & make the spacer/shim out of that . I'll go through my boxes & see if I have my lantern tool post here at my new place & see if this can even be done? . May also help someone else down the line .

animal

What tool holder are you using to hold the insert holder? A TCMT has a 7-degree positive relief angle built into it. Mentioning HTRL makes me think you are using lantern post style holders designed for square HSS bits. As far as I know of, you cannot use those holders with insert holders. They are designed for QCTP that will clamp the insert holder in a horizontal position.

Al-USA

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From: [email protected] <[email protected]> On Behalf Of straitsman via groups.io
Sent: Wednesday, March 6, 2024 3:26 PM
To: [email protected]
Subject: Re: [SouthBendLathe] Indexable carbide insert turning tools

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Thank you all for answering so promptly.??
The first reaction I had was, "Yes I need to grind the insert holder".? ?But before I did that I read again.? There are many references to the tool holder.? A tool holder means the iron you clamp in a tool post.? (HTRL p27 Figs45-50).? It also seems to mean the iron that the triangular inserts are screwed onto. (I am going to refer to these as "insert holders").? ? If the insert holder is mounted in a tool holder the angle of the cutter is raised, and the bottom corner of the insert holder comes into vertical alignment with the cutter tip. That seems to have been my problem.

I sorted it out by changing back to an HSS cutter.?

In future I will try to use HTRL Fig 50A - 10 in 1 holder.? ?This "detail" had not registered in my tiny brain before now.? I hope that I have learned something.

The inserts are advertised as TCMT, but the full p/n is not given.? ?I have now learned that there is much more to carbide inserts than I had thought.??
Thanks again to all who took the time to comment.?